Construction method for achieving underground excavation and reverse operation by utilizing combined pipe jacking

Abstract

The invention discloses a construction method for achieving underground excavation and reverse operation by utilizing combined pipe jacking. An open-cut method is adopted to excavate a pipe-jacking starting well and a pipe-jacking receiving well at the end of a station; the pipe-jacking starting well is utilized as a pipe-jacking construction operation space, a pipe-jacking machine and matched facilities are installed, and the rectangular pipe-jacking machine is adopted to execute successive jacking construction; the operation space provided by middle and side span pipe-jacking structures is utilized to sequentially remove side span pipe-jacking structure bottom steel pipe joints and middle span pipe-jacking structure bottom steel pipe joints, and vertical supporting systems such as a station surrounding structure and steel pipe posts are constructed; temporary supports are erected, part of a top plate structure of the station is constructed, and side span pipe-jacking structure side steel pipe joints and middle span pipe-jacking structure side steel pipe joints in adjacent pipe-jacking structures are sequentially removed; after the top plate structure reaches the designed strength, pipe-jacking structure bottom residual steel pipe joints are sequentially removed under the effect of a top plate shed, and an underground excavation and reverse operation method is adopted to excavate and construct structures such as side walls, middle plates and base plates of the station. The construction method can have the advantages that ultra-shallow earthing underground excavation construction can be achieved, the influence on ground traffic, ambient environment and underground pipelines is avoided, the top layer space utilization rate of the station is improved, the construction cost is reduced, the construction efficiency is high, and the construction risk is low.

Description

technical field [0001] The invention belongs to the technical field of underground structure engineering, is suitable for safe and rapid construction of underground structures under ultra-shallow soil covering of urban roads, reduces the impact on ground traffic and the demolition and modification of underground pipelines, and particularly relates to a method of using combined pipe jacking to realize underground excavation and reverse work construction method. Background technique [0002] With the rapid development of urban construction in our country, the construction of underground rail transit system is an important means to solve the traffic problems in large and medium-sized cities. At present, underground engineering construction usually adopts open-cut method, concealed excavation method, cover-excavation method and other construction methods. The technical comparison of these methods Mature but have certain disadvantages. The open and cut method has low cost and lo...

AI Technical Summary

Problems solved by technology

The open and cut method has low cost and low construction risk, but requires a large construction site, which has a great impact on ground traffic and underground pipelines; the cover-excavation method can reduce the impact on ground traffic, but the impact on the construction period is unavoidable due to the relocation of pipelines. control; the underground excavation method has little impact on ground traffic and avoids the relocation of surrounding pipelines, but requires large burial depth, good geological conditions, no water work space, and precipitation construction destroys water resources. At the same time, the construction cost is high, the safety risk is high, and the construction speed is slow

In order to improve urban residents' satisfaction with the city and the comfort of daily life in urban construction, in the development of underground space, it is necessary to minimize the impact of ground traffic, reduce the demolition and modification of underground pipelines, avoid or reduce construction enclosures, and avoid house demolition, etc. At the same time, considering the project cost, construction risk and environmental protection, the traditional construction methods have many limitations.

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